Joining the club here, 18 Denali just under 100,000 miles with a failed suspension. And not sure if this is the exact moment it failed but I drove a short hour trip on the highway only to start hearing the noise when I reached town. Didn't hit any potholes or curbs, just the start of the clunk clunk that let's you know your suspension is shot. Felt every bump since. Drove my husbands 2001 F150 over the same bumps in our neighborhood and was shocked at how much better that truck handled them. We are replacing with non magnetic struts ($800) as we can't swallow the expense for all 4 to be replaced at over $3000!